Question

The ratio of the diameter of two circles is 3:4.find the ratio of their circumferens

Answer 1

let,
r1=3x/2
r2=4x/2
The circumference (s1) of first circle is 2π3x/2
= 3xπ
the circumference(s2)of second circle is 2π4x/2
=4xπ
so,
s1:s2=3:4